Merge pull request #11 from KokJianYu/Intellisense

Auto complete functionality for commands

src/main/java/seedu/address/logic/commands/AutoCompleteCommandHelper.java

@@ -0,0 +1,35 @@
+package seedu.address.logic.commands;
+
+/**
+ * Helper class to auto complete commands typed into command box
+ */
+public class AutoCompleteCommandHelper {
+    private static String[] commandWordList = {
+        AddCommand.COMMAND_WORD,
+        ClearCommand.COMMAND_WORD,
+        DeleteCommand.COMMAND_WORD,
+        EditCommand.COMMAND_WORD,
+        ExitCommand.COMMAND_WORD,
+        FindCommand.COMMAND_WORD,
+        HelpCommand.COMMAND_WORD,
+        HistoryCommand.COMMAND_WORD,
+        ListCommand.COMMAND_WORD,
+        RedoCommand.COMMAND_WORD,
+        SelectCommand.COMMAND_WORD,
+        UndoCommand.COMMAND_WORD
+    };
+
+    /**
+     * This method predicts the command the user is entering.
+     * @param partialWord The current characters available in command box.
+     * @return The predicted command.
+     */
+    public static String autoCompleteWord(String partialWord) {
+        for (String s : commandWordList) {
+            if (s.startsWith(partialWord)) {
+                return s;
+            }
+        }
+        return null;
+    }
+}

src/main/java/seedu/address/ui/CommandBox.java

@@ -2,6 +2,7 @@
 
 import java.util.logging.Logger;
 
+import javafx.application.Platform;
 import javafx.collections.ObservableList;
 import javafx.fxml.FXML;
 import javafx.scene.control.TextField;
@@ -11,6 +12,7 @@
 import seedu.address.commons.events.ui.NewResultAvailableEvent;
 import seedu.address.logic.ListElementPointer;
 import seedu.address.logic.Logic;
+import seedu.address.logic.commands.AutoCompleteCommandHelper;
 import seedu.address.logic.commands.CommandResult;
 import seedu.address.logic.commands.exceptions.CommandException;
 import seedu.address.logic.parser.exceptions.ParseException;
@@ -33,6 +35,16 @@ public class CommandBox extends UiPart<Region> {
     public CommandBox(Logic logic) {
         super(FXML);
         this.logic = logic;
+
+        //Calls #autoCompleteWord() when new character is entered to text of command box
+        commandTextField.textProperty().addListener((observable, oldValue, newValue) -> {
+            //Only perform auto complete if adding new characters.
+            int oldValueLengthWithoutAutoComplete = oldValue.length() - commandTextField.getSelection().getLength();
+            if (oldValueLengthWithoutAutoComplete < newValue.length()) {
+                autoCompleteWord();
+            }
+        });
+
         // calls #setStyleToDefault() whenever there is a change to the text of the command box.
         commandTextField.textProperty().addListener((unused1, unused2, unused3) -> setStyleToDefault());
         historySnapshot = logic.getHistorySnapshot();
@@ -148,4 +160,23 @@ private void setStyleToIndicateCommandFailure() {
         styleClass.add(ERROR_STYLE_CLASS);
     }
 
+    /**
+     * Predict command user is inputting and type it in the command box.
+     */
+    private void autoCompleteWord() {
+        String prefix = commandTextField.getCharacters().toString();
+        String completeWord = AutoCompleteCommandHelper.autoCompleteWord(prefix);
+        //Return if there is no difference between prefix and completed word.
+        if (prefix.equals(completeWord)) {
+            return;
+        }
+
+        if (completeWord != null && prefix.length() > 0) {
+            //String strToInsert = completeWord.substring(prefix.length());
+            commandTextField.setText(completeWord);
+            Platform.runLater(() -> commandTextField.selectRange(prefix.length(), completeWord.length()));
+        }
+    }
+
+
 }